deriv LSK ETT STT aSTA ALPH OLDHOMEPAGE NEWHOMEPAGE
As /vasu is /udit, it gets /num before strong by ugidacAMs..., just like **hanumat- हनुमत्. The a अ lengthens by sAntamahat... —
**vidvas- विद्वस् m + /su → **vidvAn विद्वान्
and the /num becomes /M before s स् by nazcApadAnt... —
**vidvas- विद्वस् m + /jas → **vidvAMsas विद्वांसस्
When /vasu is whimpy, vasossampras... makes /samprasAraNa —
The /sambuddhi is
**vidvas- विद्वस् m + /sambuddhi
→ vidvass विद्वःस्
→ vidvans विद्वन्स् before strong
→ vidvan विद्वन् by saMyogAntasy...
→ !**vidvan विद्वन् "hey sage"
because sAntamahat... does not lengthen before /sambuddhi, and naGisambuddhy... preserves the n न्.